Vibrating element apparatus
AssigneeRosemount Measurement Limited
InventorsGeorge Alexander MacDonald, Jonathan James Goff
Life of this patent
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Abstract
The invention provides a method of driving a vibrating sensor in which the drive signal is combined with an amplitude modulated high frequency carrier. The signal is demodulated at a position adjacent to the component to be driven. This method may be applied to reducing cross-talk between drive and pick-up wire pairs and also to passing both drive and pickup signals, and two drive signals, down the same wire pair.
Claims10
A method of driving a vibrating sensor for a vibratory fluid meter that reduces cross talk between an excitation signal and a pick up signal, said sensor having a vibrating element;
- and drive and signal processing electronics spaced from said vibrating element, wherein said method comprises transmitting a signal to excite said vibrating element as an amplitude modulated high frequency signal, said sensor further including a demodulating facility that de-modulates said drive signal by separating the excitation signal from a carrier signal, and providing only the excitation signal to the vibrating element, wherein the demodulating facility is disposed on a distal portion of a submersible stem and disposed proximate the vibrating element, wherein the vibrating element is disposed on the distal portion of a submersible stem.
A vibrating sensor for a vibratory fluid meter that reduces cross talk between an excitation signal and a pick up signal, said sensor having a vibrating element;
- and drive and signal processing electronics spaced from said vibrating element said drive and signal processing electronics being operable to transmit a drive signal to excite said vibrating element, and to receive a pick-up signal from said vibrating element, wherein said electronics is operable to transmit said drive signal as an amplitude modulated high frequency signal, said sensor further including a demodulating facility to de-modulate said excitation signal, by separating the excitation signal from a carrier signal, and providing the excitation signal to the vibrating element, wherein the demodulating facility is disposed on a distal portion of a submersible stem and disposed proximate the vibrating element, wherein the vibrating element is disposed on the distal portion of a submersible stem.
Dependencies are inferred from the claim text.